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  #1  
Old 09-08-2008, 01:36 AM
rick
 
Join Date: Apr 2007
Location: sunnyvale
Posts: 10
A/C making noises

Air Conditioner making noises
I have a 1986 Mercedes 190e. As far as the a/c working. Works Great. But when I come to a stoplight and stopped in drive I get a rumbling / knocking type sound. Now at the stop light if I put the car in neutral. RPM raises alittle the noise lessens. If the RPM is 1000 or more I hear no noise at all.
Itís really hard to pinpoint where the noise is coming from. Maybe the fan clutch or possibly coming from the oil pan.
I do not see any real noticeable vibration or movement on the pulleys or belt.
Can someone tell me what my RPM should be with the A/C running, car stopped in drive.
Thanks for your help
Rick
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  #2  
Old 09-08-2008, 09:13 AM
slk230red's Avatar
WECO Installer
 
Join Date: Jul 2006
Location: Tampa, FL
Posts: 814
The first thing I would check is the belt tensioner shock. On mine, the bushing at the alternator end wore out and made a rattling noise at idle. Replaced the shock and no more noise.
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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible
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Old 09-29-2008, 02:53 PM
rick
 
Join Date: Apr 2007
Location: sunnyvale
Posts: 10
thanks I replaced the tensioner and shock damper problem corrected
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Old 09-29-2008, 04:59 PM
slk230red's Avatar
WECO Installer
 
Join Date: Jul 2006
Location: Tampa, FL
Posts: 814
Quote:
Originally Posted by anderbud View Post
thanks I replaced the tensioner and shock damper problem corrected
Good news! And thanks for posting what fixed your problem, that's what makes this forum successful. Maybe someone with the same problem will do a search and find this thread.

Dave
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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible
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